Abstract
Global climate change may act as a potent agent of natural selection within species with Mediterranean mountain ecosystems being particularly vulnerable. The aim of this research was to analyze whether the phenotypic plasticity of Sesleria nitida Ten. could be indicative of its future adaptive capability to global warming. Morphological, anatomical, and physiological leaf traits of two populations of S. nitida growing at different altitudes on Mount Terminillo (Italy) were analyzed. The results showed that leaf mass per unit leaf area, leaf tissue density, and total leaf thickness were 19, 3, and 31% higher in leaves from the population growing at 1,895 m a.s.l. (B site) than in leaves from the population growing at 1,100 m a.s.l. (A site), respectively. Net photosynthetic rate (P N) and respiration rate (R D) peaked in June in both A and B leaves [9.4 ± 1.3 μmol(CO2) m−2 s−1 and 2.9 ± 0.9 μmol(CO2) m−2 s−1, respectively] when mean air temperature was 16 ± 2°C. R D/P N was higher in B than in A leaves (0.35 ± 0.07 and 0.21 ± 0.03, respectively, mean of the study period). The mean plasticity index (PI = 0.24, mean of morphological, anatomical, and physiological leaf traits) reflected S. nitida adaptability to the environmental stress conditions at different altitudes on Mount Terminillo. Moreover, the leaf key traits of the two populations can be used to monitor wild populations over a long term in response to global change.
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Abbreviations
- A site:
-
1,100 m a.s.l.
- B site:
-
1,895 m a.s.l.
- C:
-
soil organic carbon content
- CD:
-
mesophyll cell density
- DM:
-
dry mass
- DXV:
-
diameter of the xylematic vessels
- E :
-
transpiration rate
- ETab :
-
abaxial epidermis thickness
- ETad :
-
adaxial epidermis thickness
- g s :
-
stomatal conductance
- HCB:
-
height of the central vascular bundle
- HLB:
-
height of the major lateral vascular bundle
- LA:
-
leaf area
- LMA:
-
leaf mass per unit leaf area
- LT:
-
total leaf thickness
- LTD:
-
leaf tissue density
- LW:
-
leaf width
- N:
-
total soil nitrogen content
- PI:
-
mean plasticity index
- PIa :
-
anatomical plasticity index
- PIm :
-
morphological plasticity index
- PIp :
-
physiological plasticity index
- P N :
-
net photosynthetic rate
- R D :
-
respiration rate
- RH:
-
relative air humidity
- SAIab :
-
abaxial stomatal area index
- SAIad :
-
adaxial stomatal area index
- SBC:
-
total surface area of bulliform cells
- SDab :
-
abaxial stomatal cell density
- SDad :
-
adaxial stomatal cell density
- SLab :
-
abaxial stomatal length
- SLab :
-
adaxial stomatal length
- SOM:
-
soil organic matter content
- SWC:
-
soil water content
- T :
-
air temperature
- T l :
-
leaf temperature
- T m :
-
mean air temperature
- T max :
-
mean maximum air temperature
- T min :
-
mean minimum air temperature
- UST:
-
thickness of the upper sclerenchyma layers
- WCB:
-
width of central vascular bundle
- WLB:
-
width of the major lateral vascular bundle
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Gratani, L., Crescente, M.F., D’Amato, V. et al. Leaf traits variation in Sesleria nitida growing at different altitudes in the Central Apennines. Photosynthetica 52, 386–396 (2014). https://doi.org/10.1007/s11099-014-0042-9
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DOI: https://doi.org/10.1007/s11099-014-0042-9